This three-necked instrument features a central neck tuned like a conventional guitar (E-A-d-g-b-e'), plus a neck on the left tuned chromatically (A-B flat-c-d flat-d-e) and one on the right tuned diatonically (c'-d'-e'-f'-g'-a'-b'-c2). The back and sides are of figured walnut. Not all of the ormolu (mercury-gilded brass) mounts on the yoke are original.